Create a Single NetCDF for list of NWM files — create_nwm

This function will take a set of NWM files and concatenate them along the time access. If NCO is installed, this file will be pivoted and optimized for time series extraction. While this function will work without NCO it is highly recommended to install the NCO binaries (http://nco.sourceforge.net/#Source). If a file list is not provided, defining the type,ensemble, and number (num) of files to download, will query the most current NWM forecasts on NOMADS.

create_nwm_nc(
  fileList = NULL,
  variable = "streamflow",
  dstfile = NULL,
  type = NULL,
  num = NULL,
  ensemble = NULL,
  nco = TRUE,
  pivot = TRUE,
  purge = TRUE,
  quiet = FALSE
)

Arguments

fileList: a vector of file paths to merge
variable: the channel file variable to extract
dstfile: the file path to write to
type: a NWM configuration
num: a number of files to download, default = all
ensemble: an ensemble member number
nco: should NCO be used? Default = TRUE
pivot: should the concatenated file be pivoted? Default = TRUE
purge: should the fileList files be deleted? Default = FALSE
quiet: should messages be silenced? Default = FALSE

Value

file path

Examples

if (FALSE) {
 create_nwm_nc(type = "short_range", dstfile = tempfile(ext = ".nc"))
 
 urls     <-  get_nomads_filelist(type = "medium_range", num = 4,  ensemble = 4)
 in_files <-  download_nomads(urls, dir = tempdir())
 create_nwm_nc(fileList = in_files, dstfile = tempfile(fileext = ".nc"))
}